Troubleshooting ThinkPad T450

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  • ondroid
    New Member
    • Oct 2024
    • 2
    • CZ
    #1

    Troubleshooting ThinkPad T450

    Hi everyone,
    I've got ThinkPad T450 with the following symptoms:

    After pressing power button:
    • The power button lights up and stays lit for ~20 seconds
    • Fan spins up immediately and spins for ~7 seconds
    • Keyboard Lock buttons flash and then go dark
    • Display goes from transparent to black within 3 seconds of pressing the power button and then goes to transparent again after the power LED turns off (panel shows no image, backlight is off)
    • With VGA monitor I get no output either
    I tried:
    • Removing RAM from socket - this gives me 1-3-3-1 beep code as it should
    • I measured all voltage lines (all voltages are normal)
      • VCC5M
      • VCC3M
      • VCCCPUCORE
      • VCC1R05AMT
      • VCC1R35A
      • VCC0R675B
      • VCC1R5B
    • I measured the following signals on the board:
      • BPWRG
      • CPUCORE_PWRGD
      • MEPWRG
      • MPWRG
      • RSMRST
      • PLTRST
      • DRAMRST
      • VCCST_PWRGD
      • VR_READY
      • Maybe some more that I didn't write down
    • I flashed BIOS downloaded from Lenovo site - no change
    • I measured signals on the display, it seems to be ok (Gets 3.3v and 20v for backlight, HPD goes high when panel goes dark, DP-AUX does not have any data going through)
    Board draws 6 to 13 watts from DC IN.
    I'm out of ideas, any help appreciated.
    Tags: board, lenovo, motherboard repair, thinkpad
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